coprocs some more
Zachary Santer <[email protected]>
| Newsgroups | gmane.comp.shells.bash.bugs |
|---|---|
| Message-ID | <CABkLJULYG6d7LKCoSe4kE1-hFC+NS0x0ic8TYhp+QVixrvqkTw@mail.gmail.com> |
From "printf -u "$fd"?": On Tue, May 21, 2024 at 3:06 PM Chet Ramey <[email protected]> wrote: > > On 5/21/24 11:14 AM, Zachary Santer wrote: > > On Tue, May 21, 2024 at 9:01 AM Chet Ramey <[email protected]> wrote: > >> > >> On 5/21/24 6:17 AM, Zachary Santer wrote: > >>> > >>> I saw that you turned MULTIPLE_COPROCS=1 on by default > >>> under devel, but haven't touched the somewhat more substantial changes > >>> that sounded forthcoming, from that whole conversation. > >> > >> Which one is that? > > > > So this email[1] was just about the config-top.h change, I guess, but > > in the prior one from you quoted there[2], you seemed to be > > referencing only removing the coproc once both file descriptors > > pointing to it have been closed by the user. > > I haven't committed to doing anything with how coprocs are reaped, and if I > do it will certainly not be before bash-5.3. Don't know if anyone is down to have this conversation again, but the devel branch is getting changes for bash-5.4 now. From "Examples of concurrent coproc usage?": On Tue, Jun 11, 2024 at 8:11 AM Zachary Santer <[email protected]> wrote: > > On Mon, Jun 10, 2024 at 1:07 PM Robert Elz <[email protected]> wrote: > > > > The next POSIX will include O_CLOFORK and FD_CLOFORK (or names > > similar to those) for open (etc) and fcntl(FDFLAGS)) - that is > > analogs of O_CLOEXEC and FD_CLOEXEC but applying to fork() rather > > than exec*(). > > Well there you go. Once people are satisfied with the extent to which > O_CLOFORK and FD_CLOFORK are present in operating systems, the coproc > keyword could simply apply that fd flag to the fds it creates. A > builtin 'fdflags' or similar could then turn it off for those fds or > on for any arbitrary fd. Looks like that "next POSIX" was literally published a few days after this email exchange. <fcntl.h> https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/fcntl.h.html 1003.1-2024 - IEEE/Open Group Standard for Information Technology--Portable Operating System Interface (POSIX™) Base Specifications, Issue 8 | IEEE Standard | IEEE Xplore https://ieeexplore.ieee.org/document/10555529 > Date of Publication: 14 June 2024 All of bash's internal machinery to keep FDs out of child processes could potentially be replaced by simply assigning FD_CLOFORK to those FDs. Zack